Root Cause Analysis

java.lang.ClassCastException

oracle.jbo.server.EntityDefImpl cannot be cast to oracle.apps.fnd.framework.server.OAEntityDefImpl
* at oracle.apps.ar.hz.components.account.customer.server.HzPuiCustAccountEOImpl.getDefinitionObject(HzPuiCustAccountEOImpl.java:252)

at oracle.apps.ar.hz.components.account.site.server.HzCustAccountSitesEOExImpl.postChanges()